Modified jetty-alpn-openjdk8-* classes to support both
pre 8u252 (via alpn-boot) and post 8u252 (via standard API).
Replaced usages of -Xbootclasspath with -javaagent, and
using Jetty ALPN Agent jar rather than Jetty ALPN boot jar.
Removed all alpn-1.8.0*.mod files since now it is
possible to use a fixed version of the ALPN Agent
to cover all the versions.
Signed-off-by: Simone Bordet <simone.bordet@gmail.com>